期刊
NANO RESEARCH
卷 12, 期 6, 页码 1347-1353出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-019-2303-1
关键词
inverse opal; ultrathin; few-layered nanosheets; MnO2; zinc ion batteries
类别
资金
- National Research Foundation of Singapore (NRF) [NRF2016NRF-NRFI001-22]
Considering the high safety, low-cost and high capacity, aqueous zinc ion batteries have been a potential candidate for energy storage ensuring smooth electricity supply. Herein, we have synthesized inverse opal manganese dioxide constructed by few-layered ultrathin nanosheets by a solution template method at mild temperature. The ultrathin nanosheets with the thickness as small as 1 nm are well separated without obvious aggregation. Used as cathode material for aqueous zinc ion batteries, the few-layered ultrathin nanosheets combined with the inverse opal structure guarantee excellent performance. A high specific discharge capacity of 262.9 mAhg(-1) is retained for the 100th cycle at a current density of 300 mAg(-1) with a high capacity retention of 95.6%. A high specific discharge capacity of 121 mAhg(-1) at a high current density of 2,000 mAg(-1) is achieved even after 5,000 long-term cycles. The ex-situ X-ray diffraction (XRD) patterns, selected-area electron diffraction (SAED) patterns and high-resolution transmission electron microscopy (HRTEM) results demonstrate that the discharge/charge processes involve the reversible formation of zinc sulfate hydroxide hydrate on the cathode while in-plane crystal structure of the layered birnessite MnO2 could be maintained. This unique structured MnO2 is a promising candidate as cathode material for high capacity, high rate capability and long-term aqueous zinc-ion batteries.
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